diff --git a/src/System.Management.Automation/namespaces/IContentWriter.cs b/src/System.Management.Automation/namespaces/IContentWriter.cs
index eee05cacf13..621808af80c 100644
--- a/src/System.Management.Automation/namespaces/IContentWriter.cs
+++ b/src/System.Management.Automation/namespaces/IContentWriter.cs
@@ -4,6 +4,7 @@
 using System.Collections;
 using System.IO;
 
+#nullable enable
 namespace System.Management.Automation.Provider
 {
     #region IContentWriter